19999991

素因数分解:

${\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{659}}^1$

素因数の和:790

約数の個数: 16

約数和(自身を含む): 22809600

約数和(自身を除く): 2809609

約数列:

[1, 11, 31, 89, 341, 659, 979, 2759, 7249, 20429, 30349, 58651, 224719, 645161, 1818181, 19999991]

約数ペア:

[(1, 19999991), (11, 1818181), (31, 645161), (89, 224719), (341, 58651), (659, 30349), (979, 20429), (2759, 7249)]